Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4OIA callsign genealogy
Currently held by Rosa Martinez, Ruth
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by WP4OIA's current licensee, walking backwards.
- Rosa Martinez, RuthPRgranted 2010-12-30cancelled 2010-12-31
Successor callsigns
Callsigns held now by people who previously held WP4OIA.
- Rosa Martinez, RuthPRgranted 2020-11-07